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ASTM D4858-08
Standard Test Method for Determination of the Tendency of Lubricants to Promote Preignition in Two-Stroke-Cycle Gasoline Engines
Automaticky přeložený název:
Standardní zkušební metoda pro stanovení tendence maziv na podporu preignition v dvoutaktní cyklu benzínových motorů
NORMA vydána dne 1.12.2008
Informace o normě:
Označení normy: ASTM D4858-08
Poznámka: NEPLATNÁ
Datum vydání normy: 1.12.2008
Kód zboží: NS-28915
Počet stran: 9
Přibližná hmotnost: 27 g (0.06 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Anotace textu normy ASTM D4858-08 :
Keywords:
air-cooled, lubricant, preignition, two-cycle gasoline engine, Air-cooled gasoline engines, Combustion chamber, Dynamometer testing, Gasoline, Heating tests--petroleum products, Ignition--petroleum products, Lubricants (fluid), Lubricating oils, Performance--petroleum products/applications, Preignition, Spark plugs, Temperature tests--petroleum products, Thermocouples, Two-stroke-cycle engines, Water-cooled gasoline engines, Yamaha CE-50S test engine
Doplňující informace
| Significance and Use | ||||||||||||||||||||||||||||||
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Two-stroke-cycle gasoline engines are generally more prone to preignition than are four-stroke-cycle engines due to the absence of the internal cooling that takes place during the induction stroke of the four-stroke-cycle engines. Preignition can lead to major piston damage, either directly due to localized overheating or as the result of preignition-induced detonation. Some lubricant additives that are widely used in four-stroke-cycle gasoline engine oils are known to increase the probability of preignition in gasoline two-stroke-cycle engines. This procedure is used to determine the tendency of an oil to induce preignition in both water-cooled and air-cooled two-stroke-cycle gasoline engines. |
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| 1. Scope | ||||||||||||||||||||||||||||||
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1.1 This test method evaluates the performance of lubricants intended for use in two-stroke-cycle spark-ignition gasoline engines which are prone to preignition. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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| 2. Referenced Documents | ||||||||||||||||||||||||||||||
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